Telephone attachment.



. J.L.D0NAT. TELEPHONE ATTACHMENT. APPLICATION FILED TBB. 11, 1911..

Paud May '7, i912.

JOSEPH L. DONAT, 0F CHICAGO, ILLINOIS.

TELEPHONE ATTACHMENT.

Application led February 11, 1911.

Specification of Letters Patent.

Patented May 7, 1912.

serial No. 607,939.

To all whom t may concern Be it known that I, JOSEPH L. DoNA'r, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Telephone At-tachments, of which the following is a specificationl My invention relates to improvements in telephone attachments.

The salient object of my invent-ion is to provide an improved attachment for a telephone transmitter which surrounds the ordinary mouth-piece of a transmitter and which is provided with an opening located at the proper distance from the end of the mouth-piece to enable the user of the transmitterto placehislips directly into the opening and talk into the mouth-piece in a low tone, or whisper, thereby to render the conversation private and inaudible to persons in the immediate vicinity of the person using the transmitter.

In the accompanying drawing, forming a part of this specification; Figure 1 is aside elevation, partly in section, of a telephone transmitter showing my improved attachment associated therewith. Fig. 2 is a transverse section on line 2 2 of Fig. 1.

In both views the same reference characters indicate similar parts.

4 5 is an ordinary telephone transmitter, provided with a mouth-piece 6 of the usual type.

7 is my improved whisper-phone, or attachment, provided with an opening as at 8, at one end, into which the lips of the users are to project when the device is in use. The other end is screw-threaded as at 9, and adapted for screw-threaded attachment to a bushing 10. This bushing is preferably made of some insulating material such as hard rubber or other like moldable substance. The bushing is provided with a screw-threaded end l1, which is of the same diameter and contains threads of the same pitch and character as the threaded end of the ordinary mouth-piece 6, so that the bushing may be inserted in the same opening of the transmitter in which the ordinary mouth-piece is usually secured. The bushing is also provided with an interior screwthreaded cavity 12 in which the ordinary mouth-piece 6 may be conveniently inserted. The bushing 10 is also provided with a larger screw-threaded cavity in which my improved and enlarged mouth-piece 7 is adapted to be inserted, leaving an annular space between the cavity last referred to and the small end of the ordinary mouth-piece for thel purpose of ventilation. Air holes 18 are made through the walls of the bushing 10, through which air passes from the mouth of the user during conversation.

My attachment may be quickly and conveniently applied to telephone transmitters by removing the ordinary mouth-piece and inserting the bushing 10 in place thereof and then, if desirable, screwing the mouth-piece 6 into the end of the bushing and then placing the attachment 7 in position in the larger bore of t-he bushing.

When my attachment is in place all extraneous sounds are thereby excluded from the transmitter, and the user of the device may modulate his voice to such an extent that it will not be heard outside of the attachment, so that the telephone, with my improvement, may be used while other persons are in the room and private conversation thereby carried on without the necessity of providing sound-proof booths, as usual, for accomplishing the same object.

What I claim is;

1. The combination with a telephone transmitter and mouth piece therefor, said transmitter and mout-h piece having the usual means of engagement therebetween of a'casing open at one end adapted and arranged to surround said mouth piece, and an attaching member supporting said casing and having means of engagement appropriate to support said mouth piece within the casing and to be itself supported by said transmitter.

2. The combination with a telephone transmitter and mouth piece therefor adapted to be screwed to said transmitter, of a casing open at one end adapted and arranged to surround said mouth piece, and a bushing supporting said casing provided with an interior and an exterior screwthreaded portion of diameter and character of thread corresponding to the threads of said transmitter parts, respectively for engagement of the threaded portion of the mouth piece and for engagement of the threaded portion of said transmitter, to maintain said parts in position.l

3. The combination with a telephone transmitter and mouth piece therefor, of a casing open at its front end adapted and on the transmitter and casing support for attachment of said casing in place on the transmitter, said casing support providing apertures between the transmitter and casing communicating between the mouth piece and casing with said front opening in the casing.

4. rlhe combination with a telephone transmitter and mouth piece therefor adapted to be screwed to the transmitter, a bushing provided with an exterior screw-threaded portion for engagement with the screwthreads of said transmitter, and an interior screw-threaded portion for engagement with the threads of said mouth-piece, an extension from said bushing providing an annular cavity, a series of perforations in the outer wall of said annular cavity, casing-engaging means upon said bushing, and an enveloping sound-retaining casing supported by said casing-engaging means, and adapted and arranged to surround said mouth piece, the forward end of said casing being shaped to receive the mouth of a user.

5. In a device of the character described for use with a telephone transmitter and mouth piece therefor, said transmitter and mouth piece providing means of engagement therebetween, of an enveloping, soundretaining casing structure providing` means of engagement corresponding with the means of engagement respectively of the mouth piece and transmitter for engagement respectively with the transmitter and mouth piece to support said casing in proper position with respect to said mouth piece and transmitter.

In testimonywhereof I hereunto set my hand in the presence of two witnesses.

' JosEPi-i L. Donar.

In the presence 03E- W. LINN ALLEN, MARY F. ALLEN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

